TextEditor: Re-work comment definition handling

No need for most of the machinery.

Change-Id: I9078174582d83da94c6c7f20282fd3a5f1742911
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/pythoneditor/pythoneditor.h

@@ -43,7 +43,6 @@ class PythonEditor : public TextEditor::BaseTextEditor
 
 public:
     explicit PythonEditor(EditorWidget *editorWidget);
-    virtual ~PythonEditor();
 
     Core::IEditor *duplicate();